6,263
edits
Changes
→ARM11 kernel
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| [[9.3.0-21|9.3.0-21]]
| [[9.3.0-21|9.3.0-X]]
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| memchunkhax
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| The kernel originally did not validate the data stored in the FCRAM kernel heap memchunk-headers for free-memory at all. Exploiting this requires raw R/W access to these memchunk-headers, like physical-memory access with gspwn.
There are ''multiple'' ways to exploit this, but the end-result for most of these is the same: overwrite code in AXIWRAM via the 0xEFF00000/0xDFF00000 kernel virtual-memory mapping.
This was fixed in [[9.3.0-21|9.3.0-X]] by checking that the memchunk(including size, next, and prev ptrs) is located within the currently used heap memory. The kernel may also check that the next/prev ptrs are valid compared to other memchunk-headers basically. When any of these checks fail, kernelpanic() is called.
| When combined with other flaws: ARM11-kernelmode code execution
| When combined with other flaws: ARM11-kernelmode code execution
| [[9.3.0-21|9.3.0-21]]
| [[9.3.0-21|9.3.0-21]]